/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.internal.causality;

import java.util.concurrent.CompletableFuture;

/** Revision change listener. */
public interface RevisionListener {
    /**
     * Invoked when a revision has been updated.
     *
     * @param revision New revision.
     * @return Future that signifies the end of the event execution.
     */
    CompletableFuture<?> onUpdate(long revision);

    /**
     * Invoked when revisions up to {@code revisionUpperBoundInclusive} have been deleted.
     *
     * @param revisionUpperBoundInclusive Upper bound of deleted revisions (inclusive).
     */
    void onDelete(long revisionUpperBoundInclusive);
}
